Unconventional contingent gas reserves for Australia, other than coal seam gas, are reported from an insitu coal gasification demonstration plant at Leigh Creek in South Australia. The total 2P reported reserves of syngas for the Leigh Creek Energy Project in the Telford Basin are 1,153 PJ ( Tcf) (Table 3).
The output process of underground coal seam gas displacement by injecting nitrogen can be divided into two stages approximately. In stage I, driven by the pressure gradient, CH 4 in the original free state is the main product. While in stage II, the desorbed CH 4 from adsorbed state is the main product driven by the concentration gradient. In ...
To produce gas from coal seams, water must be extracted first, lowering the pressure so the gas can flow out of the coal. The volume of groundwater extracted can vary significantly between individual wells, coal seams and coal basins, depending on geological conditions.
1. Introduction. Development and commercialization of coal seam gas (CSG) deposits has primarily occurred within the past 30 years in countries such as USA, Australia, Canada, China, and India [1].CSG originates from biologically and microbial transformed organic matter that has undergone geological processes [2].Typically, the gas reserves are located in coal seams which are several hundred ...
The selection of proppants is critical in the coal seam gas extraction process, where the softer coal rock surface restricts the use of high strength proppants due to its vulnerability of embedding into the surface. 2) coal properties elastic modulus of coal is the most important factor deciding the proppant behaviour in the extraction ...
To produce coal seam gas (CSG), wells are drilled into underground coal seams, bringing water (CSG water) from the seams to the surface. This process reduces pressure in the seams which allows CSG to be released. The quality of CSG water quality varies greatly, however it is generally rich in salts and other minerals.
FD mechanism in coal seam underestimated the gas diffusion in coal seam and consequently, overestimated the reaction rate of coal seam. The diffusion problem was corresponded with the theory about the diffusioncontrolled reaction of a coal particle combustion [18, 42]. Therefore, TD diffusion was applied in the following investigations.
To study the differences between various gas injection sources in the process of coal seam methane replacement, experimental research was conducted to study the influences of different gas injection sources and gas injection ratios on coal seam methane replacement by considering the strong adsorption gas CO 2 and the weak adsorption gas N experimental results show that the temperature ...
Hydraulic fracturing, more commonly known as fracking or fraccing, is used to stimulate and accelerate the flow of coal seam gas. The process involves high pressured injection of sand, water and chemicals into the coal seam gas well. The injection causes fractures in the coal seam allowing the gas to flow to the surface of the well.
Coal seam gas (CSG) is mainly a combination of methane (CH 4) and carbon dioxide and has very close methane percentage (95%) to that of natural gas (NG) (97%).In contrast biogas produced form digestion process has methane content around 68% which makes it low energy content as shown in Table to the decline in the NG resources and the low quality of biogas, CSG can be the energy resource ...
4. Coal seam gas also is called coal seam methane (CSM) and coal bed methane (CBM). 5. During the earliest stage of coalification (the process that turns plants into coal), biogenic methane is generated as a byproduct of microbial action, which is similar to the mechanism that generates methane in landfills. 6.
The China national coal mining depth is going deeper and deeper as the average annual rate of 1050 m [20].The mining depth of many coal mines in MidEast of China has reached m below surface ( 800 m in Huaibei, 850 m in Huainan, and 1000 m in Xuzhou).At these mining depths, the coal seam overburden stress ranges from 22 to 33 MPa and the coal seam gas pressure and gas content ...
Coalbed gas content is the most important parameter for forecasting and preventing the occurrence of coal and gas outburst. However, existing methods have difficulty obtaining the coalbed gas content accurately. In this study, a numerical calculation model for the rapid estimation of coal seam gas content was established based on the characteristic values of gas desorption at specific exposure ...
1 Introduction. Gas, as a concomitant component in the process of coal carbon generation, is a major factor threatening the safe operation of coal mines and constitutes an efficient and clean energy source (Qian, 2010; Daggupati et al., 2011).The study of the occurrence state and migration mechanism of gas in coal seams is of great significance for the safe production and rational utilization ...
The gas migration provides a "material basis" for the gas extraction from the fractured zone of the goaf. The pressurerelief gas from the layer adjacent to the coal seam, as well as the residual gas from the mining process, flow through fracture channels and accumulate in the goaf, creating an area of gas enrichment.
The measurement of gas content in coal seam by means of indirect method involves heavy workload, long period, high cost and complicated operation and a proneness of negative values in the process of measuring gas absorption constant. To address these problems, the gas basic parameters and coal quality indexes of 90 coal samples from 90 coal mines in 13 provinces of China are determined ...
Coal seam gas is a form of natural gas typically extracted from coal seams at depths of 3001,000 metres. Coal seam gas (CSG), also known as coal bed methane, is a mixture of a number of gases but is mostly made up of methane (generally 9597 per cent pure methane).
Coal seam predrainage technology is widely used to prevent and control gas in China's highgas coal seams, and upward drilling is a safe and reliable technology. Using the Luling Coal Mine as the study location, according to the actual situation of the site, a layerthrough drilling process was proposed.
Coal seam gas (abbreviated "CSG") is formed by the geological process of heating and compressing plant matter to create coal. Over millions of years, methane forms within the coal. The methane is trapped by water in the gaps and cracks between the coal molecules. These gaps are known as cleats.
Coal and gas outburst is a kind of dynamic phenomenon and mainly driven by gas pressure. 12, 13 The coal seams are prone to be fractured, and outburst process will be largely accelerated with the presence of high gas pressure. 14 By and large, the phenomenon of outbursts is the process of coal energy dissipation, 15, 16 which is accompanied by ...
Exploration of alternative energy resources has become essential to fulfill an everincreasing energy demand. One potential source of energy is extraction of unconventional gases, such as basincentered gas, tight gas, coal seam gas (CSG) and shale gas [1]. The extraction of natural gas from low permeability unconventional reservoirs requires ...
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